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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2013
Activity Under Equity Incentive Plans Related to Stock Options

Activity under the Company’s equity incentive plans related to stock options is set forth below (in thousands except per share amounts):

 

     Number of
Options
Outstanding
    Weighted
Average
Exercise
Price per
Share
 

Balance at December 31, 2012

     8,504      $ 3.40   

Granted

     2,503        3.69   

Forfeited

     (111     3.19   

Expired

     (189     6.71   

Exercised

     (177     2.50   
  

 

 

   

Balance at September 30, 2013

     10,530      $ 3.43   
  

 

 

   
Recognition of Stock-Based Compensation Expense

Stock-based compensation recognized on the Company’s condensed consolidated statements of operations for the three and nine months ended September 30, 2013, and 2012, was as follows (in thousands):

 

     Three Months Ended
September 30,
     Nine Months Ended
September 30,
 
     2013      2012      2013      2012  

Stock-based compensation expense by caption:

           

Research and development

   $ 132       $ 146       $ 341       $ 423   

Selling, general and administrative

     729         549         2,074         1,488   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total stock-based compensation expense

   $ 861       $ 695       $ 2,415       $ 1,911